Summarv
3
Characteristics
Functional
The Analog Line Card contains an 8050 microprocessor that provides the
following functions:
-
card self-identification
-
self-test
-
control card operation
-
status report to the controller
-
diagnostics for maintenance purposes
The Analog Line Card also provides the following:
. .
-
6OOQ
balanced terminating impedance
-
analog-to-digital and digital-to-analog conversion of transmission and
reception signals for 16 audio phone lines
-
transmission and reception of SSD signalling messages over a DS30X
signalling channel in A10 format
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-
detection of on-hook/off-hook status
-
connection of 20 Hz ringing signal and automatic disconnection when
the station goes offhook
-
synchronization for connecting and disconnecting the ringing signal to
zero crossing of ringing voltage
-
loopback of SSD messages and PCM signals for diagnostic purposes
-
indication of board status with faceplate-mounted LED
-
correct initialization of all features at power-up
-
direct reporting of digit dialed (500 sets) by collecting dial pulses
Analog line card description 553-3001-l 61